THE Crab it's a service. And so, since its creation, it has been under the command of Apple’s senior vice president of software and internet services, also known as Eddy Cue. Now stop and think about how complex it must be to make Apple's virtual assistant what. Think of all the integrations that it necessarily needs to have with all Apple operating systems (iOS, macOS, watchOS and tvOS) to be a really useful assistant. You see, I am not underestimating the other services of the company, but in my view it is undeniable that they are much more limited and less comprehensive than Siri.
Why am I saying all this? Today, Apple, through its leadership page (which won two new names) reported that Craig Federighi (Maho's software boss) is now responsible for Siri.
In practice, as the MacRumors as you said, Apple is simply confirming a transition that apparently happened many months ago if we take into account some recent interviews and appearances on the stage of Apple events when it came to Siri. In 2016, for example, Federighi was the executive who spoke with John Gruber about opening Siri to third-party applications; at WWDC 2017, he also presented the Siri-related improvements. In my view, considering the whole ecosystem that Siri is part of, it makes a lot more sense that she is under Federighi's care than Cue's.
Something that we can not fail to comment, however, how Cue is in this story. This is the second great service that ceased to be part of his umbrella in December 2015, Phil Schiller took care of the App Stores, which were also a responsibility of Cue. Now, therefore, the senior vice president of software and services for the Internet starts to lead “only” the iTunes Store, Apple Music, Apple Pay, iCloud, Maps, App Store ads and productivity apps and Ma's creativity.
Do the quotes make sense, right? Note that Cue still commands (responding directly to Tim Cook, of course) a lot at the company, but it is undeniable that he missed two of the most important services for his teammates.
In addition to a possible structural reorganization due to the nature of Siri itself (as I discussed above), Cue may be quite overwhelmed by Apple's new endeavor in the video market. It is already clear that the company should soon launch a streaming video with the right to a lot of original content. This is a key to the success of Apple TV and has been cooked by Apple internally for a long time.
Regardless of the real reason, Siri has a great evolution on Federighi's team!